Force & Motion
What must happen for an object’s motion to change?
what is a force must act on it.
What type of force slows down objects sliding on a surface?
what is fricition
Gravity pulls objects toward what?
what is the center of Earth
A straight, upward‑slanted line on a distance‑time graph shows what kind of motion?
what is Constant speed.
Rubbing a balloon on your hair creates what type of force?
what is electric force
A soccer ball rolls across the field and slows down. What does this tell you about the forces acting on it?
What is an unbalanced force is acting against its motion
Which surface would create the most friction: tile, ice, carpet, or glass?
what is Carpet
If two objects move farther apart, what happens to the gravitational force between them?
what is it decreases
A flat, horizontal line on a distance‑time graph means what?
what is the object is not moving.
Why do magnets attract some metals but not others?
what is only certain materials are magnetic
A student pushes a cart with a constant force, and the cart speeds up. What is happening to the cart’s acceleration?
what is it is increasing.
A student wants to test friction using a block and a spring scale. What should they change to test different materials?
what is the surface or the block material
A student’s mass is 40 kg on Earth. What is their mass on the Moon?
what is still 40 kg
If a runner’s graph becomes steeper over time, what does that mean?
what is the runner is speeding up.
Two charged objects repel each other. What does this tell you about their charges?
what is they have the same type of charge
A skateboarder moves at a constant speed. What can you say about the forces acting on them?
what is Forces are balanced.
Why does a sled move farther on snow than on grass?
what is snow has less friction
Why does Earth pull on objects more strongly than a person does?
what is Earth has more mass
A student walks 5 meters every second. What would their distance‑time graph look like?
what is a straight line with a steady slope upward.
A magnet sticks to a refrigerator door. What force is responsible?
what is magnetic force
A rocket launches upward. Name two forces acting on it during launch.
what is Thrust and gravity
A book stays still on a desk even though gravity pulls it downward. What force keeps it from falling through the desk?
what is The normal force from the desk.
If the mass of two objects doubles but the distance stays the same, what happens to the gravitational force?
what is it increases
A graph shows a line going upward, then flat, then upward again. Describe the motion.
what is Moving → stopped → moving again.
A student brings a charged balloon near small pieces of paper, and the paper jumps toward the balloon. Why?
what is the electric force attracts the paper